From patchwork Thu Mar 20 08:21:02 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 14023529 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0B1E4C28B30 for ; Thu, 20 Mar 2025 08:24:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=o8YCQKSCMbcpjqvqGVAud+bsNcc/Isbjy4a8q5O0R/8=; b=PkVeoGVw3NhQx9mifnTcShITtu wciy4OO6rEreYH6c1jcGDANOdFwBOCmC9mUaZSwUDHEPkEcMvdDwrXPUhlWTKAueE1OfHd1CB8hqL amRCtIzyqbojhD1PKaDZ2WXt/w8dLvj1RZMhI+2njbQ7yNHRg3zhLc7JU6AMLpgW8GWR9xHOFhFZK pb68gXAPz6sbm2zulUy0hFrOq3r6jx3Bu6KwBN2FHVrrB/Y3AYbUiEpyZmWUeXnivF3PSxA/PSEid wAX2sMQD/kVTmSe3sROYWQMaHzPyuXTZ4zlIjuUuq6yiLHI2qcmN2sMEaeAhVPt4aolaEiL/RiHg6 +wcVHreA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tvBCH-0000000BWFk-3PxB; Thu, 20 Mar 2025 08:24:13 +0000 Received: from mail-lf1-x130.google.com ([2a00:1450:4864:20::130]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tvB9L-0000000BVcC-3Rym for linux-arm-kernel@lists.infradead.org; Thu, 20 Mar 2025 08:21:13 +0000 Received: by mail-lf1-x130.google.com with SMTP id 2adb3069b0e04-543d8badc30so652220e87.0 for ; Thu, 20 Mar 2025 01:21:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1742458870; x=1743063670; darn=lists.infradead.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=o8YCQKSCMbcpjqvqGVAud+bsNcc/Isbjy4a8q5O0R/8=; b=L7jWF3rMX8e686lYbJ+iRPTHiZOVaTarzQ3veNiu4ibUltlVsCZIZpUWE5YN4/H5qf HShvpwjhLlyQKhFnYqWz2c7jB97jUiOlwpIIJxF7nwd9iwelNTnCJ+IXICBCyYMzeuRv brzKchZyWtxaPPYYRWI0ncq67JRGcjLAPWVmGGF2hj1zqJqWN6Ae3ZXs4RhuDte0GAni lIXcGtwhdvbEE3GP9xHj3J6WWAyXoGj78q5tLBX8j3DRai00iM4wrQWn79+10XivYL0h wwvjY8odM7fco5SiqGzk2cfX/giZCSyJO7OlZNvpkqlZYXKDr7S95Fd04KXQODhDzxha 7ZBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742458870; x=1743063670; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=o8YCQKSCMbcpjqvqGVAud+bsNcc/Isbjy4a8q5O0R/8=; b=avyjXF1yrRfDfuUjZuOPKL4CEQXXufWawIilJjmb6/FICu95f78YsUl9q09SxIqBG5 HAc7esBnz0DHZLTxBMoNO4J/yNUSt5iexGiUNaW5vGBs+Cx0dPYVKj10I2h9neVcFv5z mdJbKs9pfs36yrlsIrQBAc0Kwozd1J498RObIEvOY66MiqJQBTkCYk3MJGZ/PWJfWw7U yaDrc7YHV5WbhbYzMc3X8Qi2bFYOfXEDARtmGb9O2yHnWQOiaswGJ8R5UxDd4P58pZjl oEW40oZvUFn2hCoy6GYgDUMATz4JzPrT/bC3nOCKK4pP0zmvUOjcYjsr3PCtTdf6TJ3Q 0ErQ== X-Forwarded-Encrypted: i=1; AJvYcCWi0VoZL3o1yXISbwuKDQS/7OCzDL8YkAkvoNjhM/CfhJ9V3NXxDIrBgpCj973tcQzQZ2VSzyumZ6ufkN1SDXiU@lists.infradead.org X-Gm-Message-State: AOJu0YyHICsgB/akVkpYHoXC5LQolbPTBeb7/cSdifQfsGFZLS4gBpno tfej9TfpRSg/s52uRoXJCH1YxGtvL87P9r8Q2QmQBneshowidbAe X-Gm-Gg: ASbGncumMfocQhPv8NgkYgpX1ltfrQRLKe++R+ISshx6PoVY/zvQwiimjIAZfsIbWfN fNcIRgFJ3DKcGDDHf9fX9T64bojApcD7A5nXFY4Mj0aFxMNfDgcIMqRSZMScmefHlsxIW3hKrFo do0P29KoVH5FAWkhgJ0slR06wrkWeK0PydH9dcB5tV95ThLYMvs9SbAFn3EhXcby+tajslzm9Dr 6umh93mMZ1m2sZ3nWQ33sOYx3tH/nVjtjbXrEWwl8NwSGwbf8ewWU2PwxTd7M30LclJEQB4hzyr 9XMSKOGgi8abUnclICHNk9Jp/OSvufGIP8wsJ+XkHtofMkKZd6U= X-Google-Smtp-Source: AGHT+IEtQcDT1hKcr/hyPc4GQAHaaV6Ce4tKlVEIYYQ9CJsshWPNPgEWDxvASx6328HXCmwcR69h0Q== X-Received: by 2002:a05:6512:ea5:b0:549:8d16:7267 with SMTP id 2adb3069b0e04-54acb1a3327mr1879960e87.10.1742458869558; Thu, 20 Mar 2025 01:21:09 -0700 (PDT) Received: from mva-rohm ([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-549ba88536csm2134374e87.177.2025.03.20.01.21.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 01:21:07 -0700 (PDT) Date: Thu, 20 Mar 2025 10:21:02 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Matti Vaittinen , Lad Prabhakar , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Nuno Sa , David Lechner , Javier Carrasco , Guillaume Stols , Olivier Moysan , Dumitru Ceclan , Trevor Gamblin , Matteo Martelli , Alisa-Dariana Roman , AngeloGioacchino Del Regno , =?iso-8859-1?q?Jo=E3o_Paulo_Gon=E7alves?= , Ramona Alexandra Nechita , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: [PATCH v9 2/8] property: Add functions to iterate named child Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250320_012111_905614_E81C276F X-CRM114-Status: GOOD ( 20.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org There are a few use-cases where child nodes with a specific name need to be parsed. Code like: fwnode_for_each_child_node() if (fwnode_name_eq()) ... can be found from a various drivers/subsystems. Adding a macro for this can simplify things a bit. In a few cases the data from the found nodes is later added to an array, which is allocated based on the number of found nodes. One example of such use is the IIO subsystem's ADC channel nodes, where the relevant nodes are named as channel[@N]. Add helpers for iterating and counting device's sub-nodes with certain name instead of open-coding this in every user. Suggested-by: Jonathan Cameron Signed-off-by: Matti Vaittinen Reviewed-by: Andy Shevchenko Reviewed-by: Marcelo Schmitt --- Revision history: v8 => v9: - Drop the fwnode_for_each_available_named_child_node() as suggested by Sakari during v8 review: https://lore.kernel.org/all/Z9mQPJwnKAkPHriT@kekkonen.localdomain/ v7 => v8: - Fix the example in fwnode_get_named_child_node_count() documentation to use the fwnode_get_named_child_node_count() and not the device_get_named_child_node_count() - Fix the rest of the new macro's indentiations v6 => v7: - Improve kerneldoc - Inline device_get_named_child_node_count() and change it to call fwnode_get_named_child_node_count() inside - Fix indentiation of the new macros v5 => v6: - Add helpers to also iterate through the nodes. v4 => v5: - Use given name instead of string 'channel' when counting the nodes - Add also fwnode_get_child_node_count_named() as suggested by Rob. v3 => v4: - New patch as suggested by Jonathan, see discussion in: https://lore.kernel.org/lkml/20250223161338.5c896280@jic23-huawei/ --- drivers/base/property.c | 27 +++++++++++++++++++++++++++ include/linux/property.h | 20 ++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index c1392743df9c..f42f32ff45fc 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -945,6 +945,33 @@ unsigned int device_get_child_node_count(const struct device *dev) } EXPORT_SYMBOL_GPL(device_get_child_node_count); +/** + * fwnode_get_named_child_node_count - number of child nodes with given name + * @fwnode: Node which child nodes are counted. + * @name: String to match child node name against. + * + * Scan child nodes and count all the nodes with a specific name. Potential + * 'number' -ending after the 'at sign' for scanned names is ignored. + * E.g.:: + * fwnode_get_named_child_node_count(fwnode, "channel"); + * would match all the nodes:: + * channel { }, channel@0 {}, channel@0xabba {}... + * + * Return: the number of child nodes with a matching name for a given device. + */ +unsigned int fwnode_get_named_child_node_count(const struct fwnode_handle *fwnode, + const char *name) +{ + struct fwnode_handle *child; + unsigned int count = 0; + + fwnode_for_each_named_child_node(fwnode, child, name) + count++; + + return count; +} +EXPORT_SYMBOL_GPL(fwnode_get_named_child_node_count); + bool device_dma_supported(const struct device *dev) { return fwnode_call_bool_op(dev_fwnode(dev), device_dma_supported); diff --git a/include/linux/property.h b/include/linux/property.h index e214ecd241eb..3e83babac0b0 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -167,6 +167,10 @@ struct fwnode_handle *fwnode_get_next_available_child_node( for (child = fwnode_get_next_child_node(fwnode, NULL); child; \ child = fwnode_get_next_child_node(fwnode, child)) +#define fwnode_for_each_named_child_node(fwnode, child, name) \ + fwnode_for_each_child_node(fwnode, child) \ + if (!fwnode_name_eq(child, name)) { } else + #define fwnode_for_each_available_child_node(fwnode, child) \ for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\ child = fwnode_get_next_available_child_node(fwnode, child)) @@ -178,11 +182,19 @@ struct fwnode_handle *device_get_next_child_node(const struct device *dev, for (child = device_get_next_child_node(dev, NULL); child; \ child = device_get_next_child_node(dev, child)) +#define device_for_each_named_child_node(dev, child, name) \ + device_for_each_child_node(dev, child) \ + if (!fwnode_name_eq(child, name)) { } else + #define device_for_each_child_node_scoped(dev, child) \ for (struct fwnode_handle *child __free(fwnode_handle) = \ device_get_next_child_node(dev, NULL); \ child; child = device_get_next_child_node(dev, child)) +#define device_for_each_named_child_node_scoped(dev, child, name) \ + device_for_each_child_node_scoped(dev, child) \ + if (!fwnode_name_eq(child, name)) { } else + struct fwnode_handle *fwnode_get_named_child_node(const struct fwnode_handle *fwnode, const char *childname); struct fwnode_handle *device_get_named_child_node(const struct device *dev, @@ -210,6 +222,14 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name); unsigned int device_get_child_node_count(const struct device *dev); +unsigned int fwnode_get_named_child_node_count(const struct fwnode_handle *fwnode, + const char *name); +static inline unsigned int device_get_named_child_node_count(const struct device *dev, + const char *name) +{ + return fwnode_get_named_child_node_count(dev_fwnode(dev), name); +} + static inline int device_property_read_u8(const struct device *dev, const char *propname, u8 *val) { From patchwork Thu Mar 20 08:21:16 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 14023530 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A377DC28B30 for ; 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Thu, 20 Mar 2025 01:21:21 -0700 (PDT) Received: from mva-rohm ([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-549ba885129sm2145851e87.184.2025.03.20.01.21.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 01:21:20 -0700 (PDT) Date: Thu, 20 Mar 2025 10:21:16 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Andy Shevchenko , Matti Vaittinen , Lad Prabhakar , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Nuno Sa , David Lechner , Javier Carrasco , Guillaume Stols , Dumitru Ceclan , Trevor Gamblin , Matteo Martelli , Alisa-Dariana Roman , Ramona Alexandra Nechita , AngeloGioacchino Del Regno , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: [PATCH v9 3/8] iio: adc: add helpers for parsing ADC nodes Message-ID: <299f990caf58d77cc24200e8d75655661f16050e.1742457420.git.mazziesaccount@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250320_012123_713254_4CA6F0C7 X-CRM114-Status: GOOD ( 29.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org There are ADC ICs which may have some of the AIN pins usable for other functions. These ICs may have some of the AIN pins wired so that they should not be used for ADC. (Preferred?) way for marking pins which can be used as ADC inputs is to add corresponding channels@N nodes in the device tree as described in the ADC binding yaml. Add couple of helper functions which can be used to retrieve the channel information from the device node. Signed-off-by: Matti Vaittinen Reviewed-by: Andy Shevchenko --- Revision history: v8 => - No changes v7 => v8: devm_iio_adc_device_alloc_chaninfo_se(): - Treat all negative values for the max ID as 'don't care' - Return -ENOENT instead of '0' if no channels were found. v5 => v6: - Adapt to changed fwnode helper names - Fix spelling v4 => v5: - Inline iio_adc_device_num_channels() - Fix Indenting function parameters - Combine the max channel ID checks. v3 => v4: - Drop diff-channel support - Drop iio_adc_device_channels_by_property() - Add IIO_DEVICE namespace - Move industrialio-adc.o to top of the Makefile - Some styling as suggested by Andy - Re-consider included headers v2 => v3: Mostly based on review comments by Jonathan - Support differential and single-ended channels - Rename iio_adc_device_get_channels() as iio_adc_device_channels_by_property() - Improve spelling - Drop support for cases where DT comes from parent device's node - Decrease loop indent by reverting node name check conditions - Don't set 'chan->indexed' by number of channels to keep the interface consistent no matter how many channels are connected. - Fix ID range check and related comment RFC v1 => v2: - New patch --- drivers/iio/adc/Kconfig | 3 ++ drivers/iio/adc/Makefile | 2 + drivers/iio/adc/industrialio-adc.c | 82 ++++++++++++++++++++++++++++++ include/linux/iio/adc-helpers.h | 27 ++++++++++ 4 files changed, 114 insertions(+) create mode 100644 drivers/iio/adc/industrialio-adc.c create mode 100644 include/linux/iio/adc-helpers.h diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 849c90203071..37b70a65da6f 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -6,6 +6,9 @@ menu "Analog to digital converters" +config IIO_ADC_HELPER + tristate + config AB8500_GPADC bool "ST-Ericsson AB8500 GPADC driver" depends on AB8500_CORE && REGULATOR_AB8500 diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index ee19afba62b7..1c410f483029 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -3,6 +3,8 @@ # Makefile for IIO ADC drivers # +obj-$(CONFIG_IIO_ADC_HELPER) += industrialio-adc.o + # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o diff --git a/drivers/iio/adc/industrialio-adc.c b/drivers/iio/adc/industrialio-adc.c new file mode 100644 index 000000000000..b4057230e749 --- /dev/null +++ b/drivers/iio/adc/industrialio-adc.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Helpers for parsing common ADC information from a firmware node. + * + * Copyright (c) 2025 Matti Vaittinen + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + +/** + * devm_iio_adc_device_alloc_chaninfo_se - allocate and fill iio_chan_spec for ADC + * + * Scan the device node for single-ended ADC channel information. Channel ID is + * expected to be found from the "reg" property. Allocate and populate the + * iio_chan_spec structure corresponding to channels that are found. The memory + * for iio_chan_spec structure will be freed upon device detach. + * + * @dev: Pointer to the ADC device. + * @template: Template iio_chan_spec from which the fields of all + * found and allocated channels are initialized. + * @max_chan_id: Maximum value of a channel ID. Use negative value if no + * checking is required. + * @cs: Location where pointer to allocated iio_chan_spec + * should be stored. + * + * Return: Number of found channels on success. Negative value to indicate + * failure. Specifically, -ENOENT if no channel nodes were found. + */ +int devm_iio_adc_device_alloc_chaninfo_se(struct device *dev, + const struct iio_chan_spec *template, + int max_chan_id, + struct iio_chan_spec **cs) +{ + struct iio_chan_spec *chan_array, *chan; + int num_chan, ret; + + num_chan = iio_adc_device_num_channels(dev); + if (num_chan < 0) + return num_chan; + + if (!num_chan) + return -ENOENT; + + chan_array = devm_kcalloc(dev, num_chan, sizeof(*chan_array), + GFP_KERNEL); + if (!chan_array) + return -ENOMEM; + + chan = &chan_array[0]; + + device_for_each_named_child_node_scoped(dev, child, "channel") { + u32 ch; + + ret = fwnode_property_read_u32(child, "reg", &ch); + if (ret) + return ret; + + if (max_chan_id >= 0 && ch > max_chan_id) + return -ERANGE; + + *chan = *template; + chan->channel = ch; + chan++; + } + + *cs = chan_array; + + return num_chan; +} +EXPORT_SYMBOL_NS_GPL(devm_iio_adc_device_alloc_chaninfo_se, "IIO_DRIVER"); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Matti Vaittinen "); +MODULE_DESCRIPTION("IIO ADC fwnode parsing helpers"); diff --git a/include/linux/iio/adc-helpers.h b/include/linux/iio/adc-helpers.h new file mode 100644 index 000000000000..56b092a2a4c4 --- /dev/null +++ b/include/linux/iio/adc-helpers.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +/* + * The industrial I/O ADC firmware property parsing helpers + * + * Copyright (c) 2025 Matti Vaittinen + */ + +#ifndef _INDUSTRIAL_IO_ADC_HELPERS_H_ +#define _INDUSTRIAL_IO_ADC_HELPERS_H_ + +#include + +struct device; +struct iio_chan_spec; + +static inline int iio_adc_device_num_channels(struct device *dev) +{ + return device_get_named_child_node_count(dev, "channel"); +} + +int devm_iio_adc_device_alloc_chaninfo_se(struct device *dev, + const struct iio_chan_spec *template, + int max_chan_id, + struct iio_chan_spec **cs); + +#endif /* _INDUSTRIAL_IO_ADC_HELPERS_H_ */ From patchwork Thu Mar 20 08:21:45 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 14023533 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 62E3EC28B30 for ; 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Thu, 20 Mar 2025 01:21:52 -0700 (PDT) Received: from mva-rohm ([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-30c3f0fff95sm25420711fa.47.2025.03.20.01.21.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 01:21:50 -0700 (PDT) Date: Thu, 20 Mar 2025 10:21:45 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Nuno Sa , David Lechner , Javier Carrasco , Matti Vaittinen , Olivier Moysan , Guillaume Stols , Dumitru Ceclan , Trevor Gamblin , Matteo Martelli , Alisa-Dariana Roman , Andy Shevchenko , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: [PATCH v9 5/8] iio: adc: sun20i-gpadc: Use adc-helpers Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250320_012154_624580_812D07F9 X-CRM114-Status: GOOD ( 24.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The new devm_iio_adc_device_alloc_chaninfo_se() -helper is intended to help drivers avoid open-coding the for_each_node -loop for getting the channel IDs. The helper provides standard way to detect the ADC channel nodes (by the node name), and a standard way to convert the "reg" -properties to channel identification numbers, used in the struct iio_chan_spec. Furthermore, the helper can optionally check the found channel IDs are smaller than given maximum. This is useful for callers which later use the IDs for example for indexing a channel data array. The original driver treated all found child nodes as channel nodes. The new helper requires channel nodes to be named channel[@N]. This should help avoid problems with devices which may contain also other but ADC child nodes. Quick grep from arch/* with the sun20i-gpadc's compatible string didn't reveal any in-tree .dts with channel nodes named otherwise. Also, same grep shows all the in-tree .dts seem to have channel IDs between 0..num of channels. Use the new helper. Signed-off-by: Matti Vaittinen Reviewed-by: Andy Shevchenko --- NOTE: This change now drops a print "no channel children" which used to be printed if no channel nodes were found. It also changes the return value from -ENODEV to -ENOENT. Revision history: v8 => - No changes v7 => v8: - drop explicit "no channels check". It is now done inside the devm_iio_adc_device_alloc_chaninfo_se(). v6 => v7: - Fix function name in the commit message v5 => v6: - Commit message typofix v4 => v5: - Drop the diff-channel stuff from the commit message v3 => v4: - Adapt to 'drop diff-channel support' changes to ADC-helpers - select ADC helpers in the Kconfig v2 => v3: - New patch I picked the sun20i-gpadc in this series because it has a straightforward approach for populating the struct iio_chan_spec. Everything else except the .channel can use 'template'-data. This makes the sun20i-gpadc well suited to be an example user of this new helper. I hope this patch helps to evaluate whether these helpers are worth the hassle. The change is compile tested only!! Testing before applying is highly appreciated (as always!). Also, even though I tried to audit the dts files for the reg-properties in the channel nodes, use of references didn't make it easy. I can't guarantee I didn't miss anything. --- drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/sun20i-gpadc-iio.c | 39 +++++++++++------------------- 2 files changed, 15 insertions(+), 25 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index e4933de0c366..0993008a1586 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1357,6 +1357,7 @@ config SUN4I_GPADC config SUN20I_GPADC tristate "Allwinner D1/T113s/T507/R329 and similar GPADCs driver" depends on ARCH_SUNXI || COMPILE_TEST + select IIO_ADC_HELPER help Say yes here to build support for Allwinner (D1, T113, T507 and R329) SoCs GPADC. This ADC provides up to 16 channels. diff --git a/drivers/iio/adc/sun20i-gpadc-iio.c b/drivers/iio/adc/sun20i-gpadc-iio.c index 136b8d9c294f..2428ea69d676 100644 --- a/drivers/iio/adc/sun20i-gpadc-iio.c +++ b/drivers/iio/adc/sun20i-gpadc-iio.c @@ -15,6 +15,7 @@ #include #include +#include #include #define SUN20I_GPADC_DRIVER_NAME "sun20i-gpadc" @@ -149,36 +150,23 @@ static void sun20i_gpadc_reset_assert(void *data) reset_control_assert(rst); } +static const struct iio_chan_spec sun20i_gpadc_chan_template = { + .type = IIO_VOLTAGE, + .indexed = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), +}; + static int sun20i_gpadc_alloc_channels(struct iio_dev *indio_dev, struct device *dev) { - unsigned int channel; - int num_channels, i, ret; + int num_channels; struct iio_chan_spec *channels; - num_channels = device_get_child_node_count(dev); - if (num_channels == 0) - return dev_err_probe(dev, -ENODEV, "no channel children\n"); - - channels = devm_kcalloc(dev, num_channels, sizeof(*channels), - GFP_KERNEL); - if (!channels) - return -ENOMEM; - - i = 0; - device_for_each_child_node_scoped(dev, node) { - ret = fwnode_property_read_u32(node, "reg", &channel); - if (ret) - return dev_err_probe(dev, ret, "invalid channel number\n"); - - channels[i].type = IIO_VOLTAGE; - channels[i].indexed = 1; - channels[i].channel = channel; - channels[i].info_mask_separate = BIT(IIO_CHAN_INFO_RAW); - channels[i].info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); - - i++; - } + num_channels = devm_iio_adc_device_alloc_chaninfo_se(dev, + &sun20i_gpadc_chan_template, -1, &channels); + if (num_channels < 0) + return num_channels; indio_dev->channels = channels; indio_dev->num_channels = num_channels; @@ -271,3 +259,4 @@ module_platform_driver(sun20i_gpadc_driver); MODULE_DESCRIPTION("ADC driver for sunxi platforms"); MODULE_AUTHOR("Maksim Kiselev "); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_DRIVER"); From patchwork Thu Mar 20 08:22:14 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 14023534 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EC2AAC36000 for ; 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Thu, 20 Mar 2025 01:22:22 -0700 (PDT) Received: from mva-rohm ([2a10:a5c0:800d:dd00:8fdf:935a:2c85:d703]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-549ba864d7dsm2141832e87.130.2025.03.20.01.22.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Mar 2025 01:22:19 -0700 (PDT) Date: Thu, 20 Mar 2025 10:22:14 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Jonathan Cameron , Lars-Peter Clausen , Andy Shevchenko , Matti Vaittinen , Lad Prabhakar , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Nuno Sa , David Lechner , Javier Carrasco , Guillaume Stols , Dumitru Ceclan , Trevor Gamblin , Matteo Martelli , Alisa-Dariana Roman , Ramona Alexandra Nechita , AngeloGioacchino Del Regno , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev Subject: [PATCH v9 7/8] MAINTAINERS: Add IIO ADC helpers Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250320_012224_169345_C7C13856 X-CRM114-Status: GOOD ( 11.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add undersigned as a maintainer for the IIO ADC helpers. Signed-off-by: Matti Vaittinen --- Revision history: v2 => - No changes RFC v1 => v2: - New patch --- MAINTAINERS | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 8e0736dc2ee0..5b96fb864227 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11208,6 +11208,13 @@ L: linux-media@vger.kernel.org S: Maintained F: drivers/media/rc/iguanair.c +IIO ADC HELPERS +M: Matti Vaittinen +L: linux-iio@vger.kernel.org +S: Maintained +F: drivers/iio/adc/industrialio-adc.c +F: include/linux/iio/adc-helpers.h + IIO BACKEND FRAMEWORK M: Nuno Sa R: Olivier Moysan